#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int main()
{
	double r, area, circu;
	printf("Input r:");
	scanf("%lf", &r);
	area = 3.1415926 * r * r;
	circu = 2 * 3.1415926 * r;
		printf("r=%lf,area=%lf,circu=%lf", r, area, circu);
	return 0;

}